Adding 1meg simms to 4/110
gt4417a at prism.gatech.edu
gt4417a at prism.gatech.edu
Mon Apr 29 05:20:00 AEST 1991
Could someone share with me the magic of how to get a sun 4/110 to accept
some 1-meg simms? I don't have the technical manual and the system isn't
covered by our support contract anymore.
There are 32(!) simm slots on the cpu board and each of them originally
had a 256k simm installed. I installed 16 1m simms in place of 16 of the
256k simms. The whole deal ended up like this:
__HHHHHHHH___HHHHHHHH___HHHHHHHH__
| |
| ________ ________ | * I put the memory in 2 and 4. Any
| | | | | | other arrangement of the memory
| | 3 | | 4 | | wouldn't boot.
| | 8x256k | | 8x1 meg| |
| -------- -------- | * the jumpers j1300 and j1400 looked
| ________ ________ | like this originally:
| | | | | J1300 |
| | 1 | | 2 | | same XX XX = jumper
| | 8x256k | | 8x1 meg| J1400 | diff --
| -------- -------- | 256k XX
| | 1M --
| | 2PM --
| | <32M XX
| | 32M --
| |
____________________________________ * I moved the 256k jumper on the
/ \ j1300 block to 1M after I put the
A memory in.
After all of this I changed the Installed Memory (0x14) and the Memeory to
Check (0x15) to 0x12 (18) meg. I also changed 0xbd (in the cpu
configuration block) to 0x12.
After all of this when I booted it says that I only have 8meg installed
and it only checks 8meg and the message after it loads vmunix says 8meg.
Any suggestions?
Joel Skelton
Georgia Institute of Technology, Atlanta Georgia, 30332
uucp: ...!{allegra,amd,hplabs,ut-ngp}!gatech!prism!gt4417a
Internet: gt4417a at prism.gatech.edu
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